Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/137821
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dc.contributor.authorSolanki, Ankuren_US
dc.contributor.authorYadav, Pankajen_US
dc.contributor.authorTurren-Cruz, Silver-Hamillen_US
dc.contributor.authorLim, Swee Sienen_US
dc.contributor.authorSaliba, Michaelen_US
dc.contributor.authorSum, Tze Chienen_US
dc.date.accessioned2020-04-15T07:18:23Z-
dc.date.available2020-04-15T07:18:23Z-
dc.date.issued2019-
dc.identifier.citationSolanki, A., Yadav, P., Turren-Cruz, S.-H., Lim, S. S., Saliba, M., & Sum, T. C. (2019). Cation influence on carrier dynamics in perovskite solar cells. Nano Energy, 58, 604-611. doi:10.1016/j.nanoen.2019.01.060en_US
dc.identifier.issn2211-2855en_US
dc.identifier.urihttps://hdl.handle.net/10356/137821-
dc.description.abstractRubidium and Cesium cations (Rb + and Cs + ) incorporation recently emerged as a viable strategy to enhance perovskite solar cells (PSCs) efficiency. However, a clear understanding of the impact of these cations on the structure-function relationship in relation to the device performance is severely lacking. Here, we systematically investigate the influence of Rb + and Cs + on the carrier dynamics using transient optical spectroscopy and correlate with solar cell performance. Unlike Rb + , Cs + integrates well with methylammonium (MA + ) and formamidinium (FA + ) yielding increased perovskite grain size, longer charge carrier lifetimes and improved power conversion efficiency (PCE). Concomitant incorporation of Cs + /Rb + cooperatively retards radiative recombination by ~60% in the quaternary-cation based perovskite system (RbCsMAFA) compared to the dual-cation MAFA samples. By suppressing the defect density, PCEs around 20% are obtained along with more balanced charge carrier diffusion length and comparable photoluminescence quantum yield in quaternary-cation perovskites. While the synergistic addition of Rb + and Cs + is attractive for controlling defects and recombination losses in efficient solar cells development, sole incorporation of Rb + is still an engineering challenge. Importantly, our study explicates the underlying mechanisms behind the synergistic combination of cations to minimize the charge carrier losses and achieve high efficiency perovskite solar cells.en_US
dc.language.isoenen_US
dc.relationNTU SUG - M4080514en_US
dc.relationJSPS-NTU Joint Research Project M4082176en_US
dc.relationRG173/16en_US
dc.relationMOE2015-T2-2-015en_US
dc.relationMOE2016-T2-1-034en_US
dc.relationNRF-CRP14-2014-03en_US
dc.relationNRF-NRFI-2018-04en_US
dc.relation.ispartofNano Energyen_US
dc.relation.urihttps://doi.org/10.21979/N9/KAG1U8en_US
dc.rights© 2019 Elsevier. All rights reserved. This paper was published in Nano Energy and is made available with permission of Elsevier.en_US
dc.subjectScience::Physicsen_US
dc.subjectEngineering::Materialsen_US
dc.titleCation influence on carrier dynamics in perovskite solar cellsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.identifier.doi10.1016/j.nanoen.2019.01.060-
dc.description.versionAccepted versionen_US
dc.identifier.scopus2-s2.0-85061066567-
dc.identifier.volume58en_US
dc.identifier.spage604en_US
dc.identifier.epage611en_US
dc.subject.keywordsPerovskite Solar Cellen_US
dc.subject.keywordsRubidiumen_US
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